20 Jun
2008
20 Jun
'08
1:28 p.m.
Message: 28
Date: Thu, 19 Jun 2008 21:41:57 -0500
From: Jim Leonard <trixter at oldskool.org>
Sellam Ismail wrote:
I expect it was the same as slightly later mainframes, every time a
conditional jump instruction actually jumps, it flips the speaker to
the opposite state. When single shotting a program this is useful as
you can hear a click and know to not carry on down the list of
instructions, and when a program is running you can hear the tone
change as it does different tasks (because the size of the loops are
different). My 1301 has a three of four instruction program which
uses the variable delay of the multiply instruction to make a ghostly
sound.
This is very cool:
http://news.bbc.co.uk/2/hi/technology/7458479.stm
Unfortunately, no mention of how the machine produced the sound...